Anomalous surface states at interfaces in ρ-wave superconductors.

We present the results of theoretical study of surface state properties in a two-dimensional model for triplet p-wave superconductors. We derive boundary conditions for Eilenberger equations at rough interfaces and develop the approach for self-consistent solution for the spatial dependence of px- and px + ipy-wave panpotentials. In the px case we demonstrate the robustness of the zero-energy peak in the density of states (DoS) with respect to surface roughness, in contrast to the suppression of such a peak in the case of dxy symmetry. This effect is due to stability of odd-frequency pairing state at the surface with respect to disorder. In the case of the chiral px + ipy state we demonstrate the appearance of a complex multipeak subgap structure in the spectrum with increasing surface roughness. [ABSTRACT FROM AUTHOR]